As wide band gap compound semiconductors gain market share in automotive, aerospace, and industrial applications, these devices have the advantage of fast switching characteristics and high power density, but these characteristics also make noise resolution more important in circuit design.

As power density increases due to the adoption of GaN and SiC power semiconductors in the automotive field, EMI noise increases and EMI filters tend to become larger accordingly. This required a solution for EMI/EMC developers.

Texas Instruments (TI) Korea announced on the 18th at the Trade Center in Samseong-dong, Seoul that it has developed and released a new standalone active EMI filter (AEF) IC.

Introducing four types of industry-first standalone AEF ICs, 'TPSF12C1, TPSF12C3, TPSF12C1-Q1, and TPSF12C3-Q1,' TI emphasized that it reduced the inductance value of the common mode choke by up to 80% while also making its size smaller.
EMI mitigation has become a critical design consideration as electronic systems become more dense and interconnected. The AEF IC portfolio, developed by TI’s R&D lab, Kilby Labs, is capable of detecting and attenuating common-mode EMI by up to 30 dB in single-phase and three-phase AC power systems at frequencies from 100 kHz to 3 MHz.

The new AEF ICs meet stringent EMI requirements while being nearly half the size of purely passive filter solutions. △It meets CISPR 11 △CISPR 32 △CISPR 25 EMI requirements and provides solutions for noise resolution in a wide range of AC/DC power supplies △onboard chargers △servers △UPS and other similar systems where common mode noise is prevalent.

TI's active EMI filter ICs meet IEC 61000-4-5 surge immunity requirements, minimizing the need for external protection components such as transient voltage suppression (TVS) diodes.

“AEF ICs that catch common mode noise and attenuate it have been discussed conceptually, but TI is the first to commercialize it,” said Byung-Nam Ahn, team leader of Automotive Technical Support at TI Korea, who gave the presentation. “As the application gets higher and higher, the common mode noise increases and the EMI filter size also gets larger, which reduces cost efficiency. We expect that the AEF IC being released this time will be the solution to this challenge.”

It is reported that many major automakers are receiving samples of the newly released AEF IC and reviewing its application, and TI also announced that it plans to release an AEF IC that responds to differential mode noise by the end of this year.

TI added that free samples of the new standalone AEF ICs are now available for request from the TI Store, with up to five available for purchase.